Develop VSS-Apache Spark DataSource

• DataSource and DataFrame interfaces are used to ingest
  • https://docs.databricks.com/spark/latest/dataframes-datasets/index.html
• Build new VSS DataSource using DataFrame Interface API
• Implementation in Java, Python and Scala 
• Ingest examples

https://at.projects.genivi.org/wiki/display/DIRO/Value+measurement+formats